The library will register automatically with mongoose-attachments by performing require:

require('mongoose-attachments-localfs')

This 'provider' stores the images created via mongoose-attachments in the local file system.
It requires that the option 'directory' points to the absolute path of the directory where it will create subfolders per image type.

Example: type is thumb and directory points to /path/to/public/images/
When storing data into the schema, the thumbnail created by mongoose-attachemnts is stored as /path/to/public/images/thumb/<ObjectID>-thumb.<format>.
The absolute path to the image is stored in Model.image.<type>.path.

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